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f045b8c4b3
Teach buildid-cache how to add, remove, and update binary objects from other mount namespaces. Allow probe events tracing binaries in different namespaces to add their objects to the probe and build-id caches too. As a handy side effect, this also lets us access SDT probes in binaries from alternate mount namespaces. Signed-off-by: Krister Johansen <kjlx@templeofstupid.com> Tested-by: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas-Mich Richter <tmricht@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1499305693-1599-5-git-send-email-kjlx@templeofstupid.com [ Add util/namespaces.c to tools/perf/util/python-ext-sources, to fix the python binding 'perf test' ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
72 lines
2.4 KiB
Plaintext
72 lines
2.4 KiB
Plaintext
perf-buildid-cache(1)
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=====================
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NAME
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----
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perf-buildid-cache - Manage build-id cache.
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SYNOPSIS
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--------
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[verse]
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'perf buildid-cache <options>'
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DESCRIPTION
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-----------
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This command manages the build-id cache. It can add, remove, update and purge
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files to/from the cache. In the future it should as well set upper limits for
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the space used by the cache, etc.
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This also scans the target binary for SDT (Statically Defined Tracing) and
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record it along with the buildid-cache, which will be used by perf-probe.
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For more details, see linkperf:perf-probe[1].
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OPTIONS
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-------
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-a::
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--add=::
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Add specified file to the cache.
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-k::
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--kcore::
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Add specified kcore file to the cache. For the current host that is
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/proc/kcore which requires root permissions to read. Be aware that
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running 'perf buildid-cache' as root may update root's build-id cache
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not the user's. Use the -v option to see where the file is created.
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Note that the copied file contains only code sections not the whole core
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image. Note also that files "kallsyms" and "modules" must also be in the
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same directory and are also copied. All 3 files are created with read
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permissions for root only. kcore will not be added if there is already a
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kcore in the cache (with the same build-id) that has the same modules at
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the same addresses. Use the -v option to see if a copy of kcore is
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actually made.
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-r::
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--remove=::
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Remove a cached binary which has same build-id of specified file
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from the cache.
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-p::
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--purge=::
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Purge all cached binaries including older caches which have specified
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path from the cache.
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-M::
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--missing=::
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List missing build ids in the cache for the specified file.
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-u::
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--update=::
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Update specified file of the cache. Note that this doesn't remove
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older entires since those may be still needed for annotating old
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(or remote) perf.data. Only if there is already a cache which has
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exactly same build-id, that is replaced by new one. It can be used
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to update kallsyms and kernel dso to vmlinux in order to support
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annotation.
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-v::
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--verbose::
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Be more verbose.
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--target-ns=PID:
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Obtain mount namespace information from the target pid. This is
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used when creating a uprobe for a process that resides in a
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different mount namespace from the perf(1) utility.
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SEE ALSO
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--------
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linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-buildid-list[1]
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